SnO₂ Nanostructure as Pollutant Gas Sensors: Synthesis, Sensing Performances, and Mechanism

Table 3

Performance of SnO₂ toward main pollutants gases.

Gas	Concentration	Morphology	Particle size; (nm)	Sensing performance	Reference
CO	n/a	Sheet-like	19,26	Sensitivity = 17,7 at 275°C
		Nanogranular	10,59	Sensitivity = 19 at 300°C	[24]
		Nanoflower-like	16,78	Sensitivity = 71,5 at 250°C
	n/a	Prism-like	128	Sensitivity = 38 at 300°C	[25]
		Mix Prism-like and nanoflower-like	62	Sensitivity = 847 at 200°C
CO	n/a	Nanoflower-like	39	Sensitivity = 1217 at 275°C
		Cubic-like	60	Sensitivity = 73 at 300°C	[25]
		Nanosheet-like	26	Sensitivity = 119 at 300°C
	1000 ppm	Nanophorus	n/a	Sensitivity = 45	[26]
CO2	100 ppm	n/a	n/a	Sensitivity = 0,05 at 303 K
	300 ppm	n/a	n/a	Sensitivity = 0,09 at 323 K	[27]
	700 ppm	n/a	n/a	Sensitivity = 0,18 at 343 K
SO2	5 ppm	n/a	n/a	Response 20%	[28]
	100 ppm	n/a	n/a	Response 37%
NO2	100 ppm	n/a	n/a	Sensitivity = 19% at 200°C	[29]
	10–100 ppm	n/a	n/a	Response time is 30 till 7 seconds and the recovery time is 302 till 1202 seconds
	2 ppm	Hollow nanofibers	n/a	Response percentage 81,4 Response time = 55 seconds	[30]
	1 ppm	Hollow nanofibers	n/a	Response time = 57 seconds
	0,5 ppm	Hollow nanofibers	n/a	Response time = 79 seconds
	2 ppm	Planar	n/a	Response percentage 19,9 Response time = 55 seconds
	1 ppm	Planar	n/a	Response time = 56 seconds
	0,5 ppm	Planar	n/a	Response time = 96 seconds
N2O	300 ppm	n/a	n/a	Sensitivity = 1,66 at 450°C	[9]